Rheological properties of the blends of polychloroprene with poly[ethylene(vinyl acetate)]

✍ Scribed by P. P. Kundu; A. K. Bhattacharya; D. K. Tripathy

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 227 KB
• Volume: 66
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19971128)66:9<1759::aid-app14>3.0.co;2-q

✦ Synopsis

Blends of poly[ethylene(vinylacetate)

] (EVAc-45; 45% VAc content) and polychloroprene (CR) have been studied with respect to capillary and dynamic flow. It is found that EVAc-45, CR, and their blends are shear thinning (pseudoplastic) in nature. Though shear viscosity ( h a ) and dynamic out-of-phase viscosity ( h Љ E ) obeys power law, dynamic elongational viscosity ( h E ) does not follow it due to the synchronization of molecular vibration with the applied frequency at around 11 Hz. Both h a and h E of the blends show positive deviation with respect to their additive values. The relative positive deviation (RPD) in shear flow increases with increasing temperature and shear rate. In the case of dynamic flow, RPD increases with increasing temperature but exhibits a decreasing trend with increasing frequency. RPD can be fitted well into a fifth-order equation with a weight fraction of CR (W CR ) in EVAc-45-CR blends. From rheological point of view, this relative positive deviation indicates blend compatibility between EVAc-45 and CR.